Codeigniter develop latest.

1 files changed, 80 insertions, 0 deletions

diff --git a/user_guide_src/source/database/fields.rst b/user_guide_src/source/database/fields.rst
new file mode 100644
index 000000000..b706ace7d
--- /dev/null
+++ b/user_guide_src/source/database/fields.rst
@@ -0,0 +1,80 @@
+##########
+Field Data
+##########
+
+$this->db->list_fields()
+=========================
+
+Returns an array containing the field names. This query can be called
+two ways:
+
+1. You can supply the table name and call it from the $this->db->
+object::
+
+	$fields = $this->db->list_fields('table_name');
+	
+	foreach ($fields as $field)
+	{
+		echo $field;
+	}
+
+2. You can gather the field names associated with any query you run by
+calling the function from your query result object::
+
+	$query = $this->db->query('SELECT * FROM some_table');
+	
+	foreach ($query->list_fields() as $field)
+	{
+		echo $field;
+	}
+
+$this->db->field_exists()
+==========================
+
+Sometimes it's helpful to know whether a particular field exists before
+performing an action. Returns a boolean TRUE/FALSE. Usage example::
+
+	if ($this->db->field_exists('field_name', 'table_name'))
+	{
+		// some code...
+	}
+
+.. note:: Replace *field_name* with the name of the column you are looking
+	for, and replace *table_name* with the name of the table you are
+	looking for.
+
+$this->db->field_data()
+========================
+
+Returns an array of objects containing field information.
+
+Sometimes it's helpful to gather the field names or other metadata, like
+the column type, max length, etc.
+
+.. note:: Not all databases provide meta-data.
+
+Usage example::
+
+	$fields = $this->db->field_data('table_name');
+	
+	foreach ($fields as $field)
+	{
+		echo $field->name;
+		echo $field->type;
+		echo $field->max_length;
+		echo $field->primary_key;
+	}
+
+If you have run a query already you can use the result object instead of
+supplying the table name::
+
+	$query = $this->db->query("YOUR QUERY");
+	$fields = $query->field_data();
+
+The following data is available from this function if supported by your
+database:
+
+-  name - column name
+-  max_length - maximum length of the column
+-  primary_key - 1 if the column is a primary key
+-  type - the type of the column
\ No newline at end of file